. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. a, ,1 tl. —I i_ tlnit hi HW I Figure 7. Vocalizations and Pose of Muscisaxicola brevi- CGudo: 7a. "tchek" (compare with Fig. lid); 7b. "tchk" (this occasionally intergrades Into the previous vocalization); 7c. "tk" (compare v/lth the elements of a "tchk"); 7d. "tk ' (compare with Fig. 6a]; 7e. "tk" (compare with Fig. 5a); 7f. prolonged series vocalization uttered while perched (all but the last unit of the introductory series has been omitted); 7g. prolonged serie
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. a, ,1 tl. —I i_ tlnit hi HW I Figure 7. Vocalizations and Pose of Muscisaxicola brevi- CGudo: 7a. "tchek" (compare with Fig. lid); 7b. "tchk" (this occasionally intergrades Into the previous vocalization); 7c. "tk" (compare v/lth the elements of a "tchk"); 7d. "tk ' (compare with Fig. 6a]; 7e. "tk" (compare with Fig. 5a); 7f. prolonged series vocalization uttered while perched (all but the last unit of the introductory series has been omitted); 7g. prolonged series vocalization uttered during Aerial Display (all but the last unit of the introductory series has been omitted); 7h. customary pose while uttering a prolonged series vocalization from a perch. (Fig. Yd, compare with "tek" of M. inaculi- rostrls) is .sometimes uttered irregularly by a bird which alternates foraging with perching on a bush and uses this and no other calls; it also utters this call some- times on landing from a short flight. Oc- casionally a series of this version comes just after landing, followed by one or more "tchk" calls leading to the prolonged vocalization. Series of the second version (Fig. 7e) may be the more usual among successive prolonged vocalizations of a flying bird, and often continue as a bird completes a relatively long flight. Such long terminal series are broken by an occasional "tk" (Fig. 7c). On the whole, these last two versions of "tk" appear to correspond closely to "tek" and "tk" in the repertoire of M. maculirosiris, and must be related to Simple Vocalizations. (3) Prolonged series vocalizations (Fig. 7f) are uttered either from perches atop cotton bushes or during Aerial Displays. Those in flight are usually, but not invari- ably, less complex (Fig. 7g). All evidence indicates that the prolonged vocalizations correspond at least in part to what is usually called "song&q
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